Based on the options provided, if you have a picture of bats interacting with each other, the response would depend on the specific actions depicted in the image.
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If the bats are seen caring for young bats, the correct response would be: "They are helping each other to raise babies."
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If they appear to be in a protective formation, the correct choice would be: "They are helping each other to stay safe."
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If they are foraging or hunting together, then the appropriate response would be: "They are working together to get food."
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If they are actively constructing a roosting site, then you would select: "They are working together to build a shelter."
Please choose the response that best fits the picture you have in mind.